Question

Write the coordinates of the vertices after a rotation of 90° counterclockwise around the origin.Q(-9, 8)R(8, 0)S(-10, 0)

Answer 1

After a rotation of 90º counterclockwise, a point P(x, y) is transformed to P'(-y, x).

Thus, after the rotation, the given points will become:

Q(-9, 8) → Q'(-8, -9)

R(8, 0) → R'(0, 8)

S(-10, 0) → S'(0, -10)

The black points below are the given points, and the blue ones are the transformed points: